The suite tells you what the system is actually willing to promise.
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A test suite is not a quality assurance artifact. It is a conversation between past-you and future-you about what the system is actually willing to promise. Every test is a statement of intent that the codebase has accepted as binding.
Suites that test the wrong things tell future-you about the wrong promises. Suites that test the right things become the most useful documentation any project has ever had.
Write tests like you are dictating the system’s contract. Because you are.
